Checklist

• I have verified that that issue exists against the master branch of Django REST framework.
• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• This is not a usage question. (Those should be directed to the discussion group instead.)
• This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.
• I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

Add some simple DRF urls but namespaced, like:

url(r'^api/', include('api.urls', namespace='api'))

Expected behavior

When using HyperlinkedModelSerializer, I would expect for url namespace to be handled automatically.

Actual behavior

HyperlinkedModelSerializer is building the related url without namespace. The url is simply built from model name (%(model_name)s-detail). In this way, a namespaced url can't be resolved.